In the late 19th century, the early school of psychology that was heavily influenced by biology was functionalism.
What is meant by functionalism?
This is the term that stemmed from the theory that all the aspects of the society as well as the institutions and the roles in it are indispensable and they are all needed for the long term survival of the human society at large.
This theory is actually used by sociologists although the field that influenced it was biology. Hence we have to say that In the late 19th century, the early school of psychology that was heavily influenced by biology was  functionalism.
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